The antonyms for the term "most unsmiling" are lively, cheerful, joyful, happy, and bright. These words describe individuals who enjoy life and share positive energy with others around them. They are the opposite of those who are unsmiling or unhappy. A lively person often has contagious energy and enthusiasm, bringing others around them to their level of fun and excitement. A cheerful individual exudes a warm and positive attitude, uplifting others with their smile and joyfulness. A joyful person is filled with happiness and appreciation for life, spreading their joy to others. Finally, a bright person is intelligent, quick-witted, and shining, undoubtedly uplifting to others.